To provide a charging/discharging device capable of performing charging and discharging on a plurality of secondary cells concurrently in parallel without adopting a power source having an extremely high current supply capacity. The present invention provides a charging/discharging device which causes a plurality of charge/discharge members to perform charge operation and discharge operation concurrently in parallel, including power lines for charging to provide electric power supplied from a power unit to the respective charge/discharge members, power lines for discharging to provide electric power discharged from the respective charge/discharge members to the power unit, a plurality of connection switching units which switch connection of the plurality of charge/discharge members with the power lines for charging and the power lines for discharging as being interposed respectively between the plurality of charge/discharge members and each of the power lines for charging and the power lines for discharging, and a switching control unit which controls switching of the plurality of connection switching units. Here, the power unit applies voltages having a plurality of mutually-different voltage values and the switching control unit controls switching so that the respective charge/discharge members are connected cyclically in predetermined order to the plurality of power lines for charging and the plurality of power lines for discharging.